Buy the LabRadar and be done with it. I use it most of the time when shooting.
I do live on a ranch and have my own range. It has given lots of good data about loads and Velocity vs temperature data.
Buy once and cry once. They are on sale right now.
I got the magnetospeed cuz I'm cheap...problem is most of us shoot for velocity then pull the MS off to shoot for groups. A couple years of that and I will have spent as much on components as I saved by getting the MS instead of the labradar. That's my take on buy once cry once. Not that one is better than the other, but over time the LR is cheaper. But then again I dont own both to do side-by-side testing